kernel/2.6.29.6-aldebaran-rt/arch/parisc/include/asm/dma-mapping.h

   1 #ifndef _PARISC_DMA_MAPPING_H
   2 #define _PARISC_DMA_MAPPING_H
   3
   4 #include <linux/mm.h>
   5 #include <asm/cacheflush.h>
   6 #include <asm/scatterlist.h>
   7
   8 /* See Documentation/PCI/PCI-DMA-mapping.txt */
   9 struct hppa_dma_ops {
  10         int  (*dma_supported)(struct device *dev, u64 mask);
  11         void *(*alloc_consistent)(struct device *dev, size_t size, dma_addr_t *iova, gfp_t flag);
  12         void *(*alloc_noncoherent)(struct device *dev, size_t size, dma_addr_t *iova, gfp_t flag);
  13         void (*free_consistent)(struct device *dev, size_t size, void *vaddr, dma_addr_t iova);
  14         dma_addr_t (*map_single)(struct device *dev, void *addr, size_t size, enum dma_data_direction direction);
  15         void (*unmap_single)(struct device *dev, dma_addr_t iova, size_t size, enum dma_data_direction direction);
  16         int  (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction);
  17         void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nhwents, enum dma_data_direction direction);
  18         void (*dma_sync_single_for_cpu)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
  19         void (*dma_sync_single_for_device)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
  20         void (*dma_sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
  21         void (*dma_sync_sg_for_device)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
  22 };
  23
  24 /*
  25 ** We could live without the hppa_dma_ops indirection if we didn't want
  26 ** to support 4 different coherent dma models with one binary (they will
  27 ** someday be loadable modules):
  28 **     I/O MMU        consistent method           dma_sync behavior
  29 **  =============   ======================       =======================
  30 **  a) PA-7x00LC    uncachable host memory          flush/purge
  31 **  b) U2/Uturn      cachable host memory              NOP
  32 **  c) Ike/Astro     cachable host memory              NOP
  33 **  d) EPIC/SAGA     memory on EPIC/SAGA         flush/reset DMA channel
  34 **
  35 ** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
  36 **
  37 ** Systems (eg PCX-T workstations) that don't fall into the above
  38 ** categories will need to modify the needed drivers to perform
  39 ** flush/purge and allocate "regular" cacheable pages for everything.
  40 */
  41
  42 #ifdef CONFIG_PA11
  43 extern struct hppa_dma_ops pcxl_dma_ops;
  44 extern struct hppa_dma_ops pcx_dma_ops;
  45 #endif
  46
  47 extern struct hppa_dma_ops *hppa_dma_ops;
  48
  49 static inline void *
  50 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
  51                    gfp_t flag)
  52 {
  53         return hppa_dma_ops->alloc_consistent(dev, size, dma_handle, flag);
  54 }
  55
  56 static inline void *
  57 dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
  58                       gfp_t flag)
  59 {
  60         return hppa_dma_ops->alloc_noncoherent(dev, size, dma_handle, flag);
  61 }
  62
  63 static inline void
  64 dma_free_coherent(struct device *dev, size_t size,
  65                     void *vaddr, dma_addr_t dma_handle)
  66 {
  67         hppa_dma_ops->free_consistent(dev, size, vaddr, dma_handle);
  68 }
  69
  70 static inline void
  71 dma_free_noncoherent(struct device *dev, size_t size,
  72                     void *vaddr, dma_addr_t dma_handle)
  73 {
  74         hppa_dma_ops->free_consistent(dev, size, vaddr, dma_handle);
  75 }
  76
  77 static inline dma_addr_t
  78 dma_map_single(struct device *dev, void *ptr, size_t size,
  79                enum dma_data_direction direction)
  80 {
  81         return hppa_dma_ops->map_single(dev, ptr, size, direction);
  82 }
  83
  84 static inline void
  85 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  86                  enum dma_data_direction direction)
  87 {
  88         hppa_dma_ops->unmap_single(dev, dma_addr, size, direction);
  89 }
  90
  91 static inline int
  92 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  93            enum dma_data_direction direction)
  94 {
  95         return hppa_dma_ops->map_sg(dev, sg, nents, direction);
  96 }
  97
  98 static inline void
  99 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 100              enum dma_data_direction direction)
 101 {
 102         hppa_dma_ops->unmap_sg(dev, sg, nhwentries, direction);
 103 }
 104
 105 static inline dma_addr_t
 106 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
 107              size_t size, enum dma_data_direction direction)
 108 {
 109         return dma_map_single(dev, (page_address(page) + (offset)), size, direction);
 110 }
 111
 112 static inline void
 113 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 114                enum dma_data_direction direction)
 115 {
 116         dma_unmap_single(dev, dma_address, size, direction);
 117 }
 118
 119
 120 static inline void
 121 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
 122                 enum dma_data_direction direction)
 123 {
 124         if(hppa_dma_ops->dma_sync_single_for_cpu)
 125                 hppa_dma_ops->dma_sync_single_for_cpu(dev, dma_handle, 0, size, direction);
 126 }
 127
 128 static inline void
 129 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
 130                 enum dma_data_direction direction)
 131 {
 132         if(hppa_dma_ops->dma_sync_single_for_device)
 133                 hppa_dma_ops->dma_sync_single_for_device(dev, dma_handle, 0, size, direction);
 134 }
 135
 136 static inline void
 137 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 138                       unsigned long offset, size_t size,
 139                       enum dma_data_direction direction)
 140 {
 141         if(hppa_dma_ops->dma_sync_single_for_cpu)
 142                 hppa_dma_ops->dma_sync_single_for_cpu(dev, dma_handle, offset, size, direction);
 143 }
 144
 145 static inline void
 146 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 147                       unsigned long offset, size_t size,
 148                       enum dma_data_direction direction)
 149 {
 150         if(hppa_dma_ops->dma_sync_single_for_device)
 151                 hppa_dma_ops->dma_sync_single_for_device(dev, dma_handle, offset, size, direction);
 152 }
 153
 154 static inline void
 155 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 156                  enum dma_data_direction direction)
 157 {
 158         if(hppa_dma_ops->dma_sync_sg_for_cpu)
 159                 hppa_dma_ops->dma_sync_sg_for_cpu(dev, sg, nelems, direction);
 160 }
 161
 162 static inline void
 163 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 164                  enum dma_data_direction direction)
 165 {
 166         if(hppa_dma_ops->dma_sync_sg_for_device)
 167                 hppa_dma_ops->dma_sync_sg_for_device(dev, sg, nelems, direction);
 168 }
 169
 170 static inline int
 171 dma_supported(struct device *dev, u64 mask)
 172 {
 173         return hppa_dma_ops->dma_supported(dev, mask);
 174 }
 175
 176 static inline int
 177 dma_set_mask(struct device *dev, u64 mask)
 178 {
 179         if(!dev->dma_mask || !dma_supported(dev, mask))
 180                 return -EIO;
 181
 182         *dev->dma_mask = mask;
 183
 184         return 0;
 185 }
 186
 187 static inline int
 188 dma_get_cache_alignment(void)
 189 {
 190         return dcache_stride;
 191 }
 192
 193 static inline int
 194 dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
 195 {
 196         return (hppa_dma_ops->dma_sync_single_for_cpu == NULL);
 197 }
 198
 199 static inline void
 200 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 201                enum dma_data_direction direction)
 202 {
 203         if(hppa_dma_ops->dma_sync_single_for_cpu)
 204                 flush_kernel_dcache_range((unsigned long)vaddr, size);
 205 }
 206
 207 static inline void *
 208 parisc_walk_tree(struct device *dev)
 209 {
 210         struct device *otherdev;
 211         if(likely(dev->platform_data != NULL))
 212                 return dev->platform_data;
 213         /* OK, just traverse the bus to find it */
 214         for(otherdev = dev->parent; otherdev;
 215             otherdev = otherdev->parent) {
 216                 if(otherdev->platform_data) {
 217                         dev->platform_data = otherdev->platform_data;
 218                         break;
 219                 }
 220         }
 221         BUG_ON(!dev->platform_data);
 222         return dev->platform_data;
 223 }
 224
 225 #define GET_IOC(dev) (HBA_DATA(parisc_walk_tree(dev))->iommu);
 226
 227
 228 #ifdef CONFIG_IOMMU_CCIO
 229 struct parisc_device;
 230 struct ioc;
 231 void * ccio_get_iommu(const struct parisc_device *dev);
 232 int ccio_request_resource(const struct parisc_device *dev,
 233                 struct resource *res);
 234 int ccio_allocate_resource(const struct parisc_device *dev,
 235                 struct resource *res, unsigned long size,
 236                 unsigned long min, unsigned long max, unsigned long align);
 237 #else /* !CONFIG_IOMMU_CCIO */
 238 #define ccio_get_iommu(dev) NULL
 239 #define ccio_request_resource(dev, res) insert_resource(&iomem_resource, res)
 240 #define ccio_allocate_resource(dev, res, size, min, max, align) \
 241                 allocate_resource(&iomem_resource, res, size, min, max, \
 242                                 align, NULL, NULL)
 243 #endif /* !CONFIG_IOMMU_CCIO */
 244
 245 #ifdef CONFIG_IOMMU_SBA
 246 struct parisc_device;
 247 void * sba_get_iommu(struct parisc_device *dev);
 248 #endif
 249
 250 /* At the moment, we panic on error for IOMMU resource exaustion */
 251 #define dma_mapping_error(dev, x)       0
 252
 253 #endif